Cocos2d-x 读取网络图片创建精灵

Cocos2d-x 2.1.4 里面已经为我们提供了HttpRequest ，HttpClient，CCHttpResponse用于处理网络相关操作

下面简单利用这些封装好的类，来读取网络图片并创建精灵

1.在工程里面导入HttpRequest.h，HttpClient.h

#include "HelloWorldScene.h"
#include "SimpleAudioEngine.h"
#include "HttpRequest.h"
#include "HttpClient.h"

USING_NS_CC;
USING_NS_CC_EXT;
using namespace std;

CCScene* HelloWorld::scene()
{
    CCScene *scene = CCScene::create();
    HelloWorld *layer = HelloWorld::create();
    scene->addChild(layer);
    return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    if ( !CCLayer::init() )
    {
        return false;
    }

    CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
                                        "CloseNormal.png","CloseSelected.png",this,menu_selector(HelloWorld::menuCloseCallback) );
    pCloseItem->setPosition( ccp(CCDirector::sharedDirector()->getWinSize().width - 20,20) );

    CCMenu* pMenu = CCMenu::create(pCloseItem,NULL);
    pMenu->setPosition( CCPointZero );
    this->addChild(pMenu,1);
//  这是个静态方法，得到一个httpClient实例
    CCHttpClient* httpClient = CCHttpClient::getInstance();
//    创建一个CCHttpRequest对象
    CCHttpRequest* httpReq =new CCHttpRequest();
//    设置请求类型
    httpReq->setRequestType(CCHttpRequest::kHttpGet);
//  设置请求Url(可以更具需要从json 或xml,甚至html里解析获得到这个图片url)
    httpReq->setUrl("http://avatar.csdn.net/A/6/5/1_qqxj2012.jpg");
//    请求完成后回调
    httpReq->setResponseCallback(this,callfuncND_selector(HelloWorld::onGetFinished));
//   为请求设置标签,后面可以根据这个标签来获取我们要的数据
    httpReq->setTag("PicGet");
//    设置连接超时时间
    httpClient->setTimeoutForConnect(30);
    httpClient->send(httpReq);
    httpReq->release();
    httpReq=NULL;

    return true;
}


void HelloWorld::onGetFinished(CCNode* node,CCObject* obj)
{
    CCHttpResponse* response = (CCHttpResponse*)obj;
//    判断是否响应成功
    if (!response->isSucceed())
    {
        CCLog("Receive Error! %sn",response->getErrorBuffer());
        return ;
    }
    
    const char* tag = response->getHttpRequest()->getTag();
    if (0 == strcmp("PicGet",tag))
    {
        vector<char> *data = response->getResponseData();
        int data_length = data->size();
        string res;
        for (int i = 0;i<data_length;++i)
        {
            res+=(*data)[i];
        }
        res+='';
        CCLog("%s",res.c_str());
    }
    
    // 数据转存
    unsigned char* pBuffer = NULL;
    unsigned long bufferSize = 0;
    vector<char> *buffer = response->getResponseData();
    string path = CCFileUtils::sharedFileUtils()->getWritablePath()+"test.png";
    pBuffer = CCFileUtils::sharedFileUtils()->getFileData(path.c_str(),"r",&bufferSize);
    string buff(buffer->begin(),buffer->end());
    
    //保存到本地文件
    CCLOG("path: %s",path.c_str());
    FILE *fp = fopen(path.c_str(),"wb+");
    fwrite(buff.c_str(),1,buffer->size(),fp);
    fclose(fp);
    
}
void HelloWorld::menuCloseCallback(CCObject* pSender)
{
    unsigned char* pBuffer = NULL;
    unsigned long bufferSize = 0;
    string path = CCFileUtils::sharedFileUtils()->getWritablePath()+"test.png";
    pBuffer = CCFileUtils::sharedFileUtils()->getFileData(path.c_str(),&bufferSize);
    if (!pBuffer)
    {
        return ;
    }
    CCImage* img = new CCImage;
    img->initWithImageData(pBuffer,bufferSize);
    free(pBuffer);
    CCTexture2D* texture = new cocos2d::CCTexture2D();
    bool isImg = texture->initWithImage(img);
    img->release();
    if (!isImg)
    {
        delete texture;
        return ;
    }
    //这里建议使用成员变量来保存精灵，不然有可能导致显示白色块，出现异常！
    sp =CCSprite::createWithTexture(texture);
    CCSprite* sprite = CCSprite::createWithTexture(sp->getTexture());
    sprite->setPosition(ccp(240,160));
    this->addChild(sprite,10);
    texture->release();
    
}

IOS运行截图：

Android 运行截图：

最后说明：

1.Android 运行前，记得在AndroidManifest.xml 开启网络，读取SD卡等权限，不然不会显示！

<!-- 访问internet权限 -->
<uses-permission android:name="android.permission.INTERNET"/>
<!-- 在SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.REORDER_TASKS"/>

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>  
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission> 

2.这里只是简单实现，并没有实现图片异步加载，后续逐渐完善！

FROM:http://www.xuebuyuan.com/1353683.html

（编辑：李大同）

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